Chi Square Flashcards
Examples of parametric stats
Z-test, Pearsons r, ANOVA
Assumptions of parametric stats
Normal distribution
Similar variance across groups
Data are interval or ratio
Non parametric stats when is it used
Nominal and ordinal data (spearman’s rho, phi coefficient)
Non parametric stats
Non-normally distributed data (heavily skewed)
Data that have heterogeneous variance (one group more variable)
Do parametric stats have a non parametric alternative?
Yes many do
What is chi square
Make comparisons but data is nominal (no means). When DV is nominal and we are looking at the frequency of falling into different categories. Test whether frequencies are by chance or a theorized pattern
What is chi square similar to
Phi coefficient. The phi coefficient is used as an effect size.
What is DV in chi square
Frequency
How many variables are in a one way chi square
Data characterized by one variable only
How many levels does a category have
Any # ex: if it’s birth month it would have 12
What does goodness of fit mean
How well does our data fit the null
If a chi square has a degrees of freedom of 1 what does that mean
You can make stronger claims
What is the null for a chi square
Ho= the observed frequency match what would be expected due to chance
What is the alternative for chi square
Ha does not equal frequencies lexpected by chance
How do you find the expected frequency for a one way chi square
N/k
